NEW YORK, Feb. 4, 2026 /PRNewswire/ — S&P Dow Jones Indices will make the following changes to the S&P 500, S&P MidCap 400, S&P SmallCap 600:
S&P MidCap 400 constituent Ciena Corp. (NYSE: CIEN) will replace Dayforce Inc. (NYSE: DAY) in the S&P 500, S&P SmallCap 600 constituent Arrowhead Pharmaceuticals Inc. (NASD: ARWR) will replace Ciena in the S&P MidCap 400, and ADT Inc. (NYSE: ADT) will replace Arrowhead Pharmaceuticals in the S&P SmallCap 600 effective prior to the opening of trading on Monday, February 9. Thoma Bravo L.P. acquired Dayforce in a deal that closed today.
OneSpaWorld Holdings Ltd. (NASD: OSW) will replace Dynavax Technologies Corp. (NASD: DVAX) in the S&P SmallCap 600 effective prior to the opening of trading on Tuesday, February 10. Sanofi is acquiring Dynavax Technologies in a deal expected to be completed soon pending final closing conditions.
Following is a summary of the changes that will take place prior to the open of trading on the effective date:
|
Effective Date |
Index Name |
Action |
Company Name |
Ticker |
GICS Sector |
|
Feb 9, 2026 |
S&P 500 |
Addition |
Ciena |
CIEN |
Information Technology |
|
Feb 9, 2026 |
S&P 500 |
Deletion |
Dayforce |
DAY |
Industrials |
|
Feb 9, 2026 |
S&P MidCap 400 |
Addition |
Arrowhead Pharmaceuticals |
ARWR |
Health Care |
|
Feb 9, 2026 |
S&P MidCap 400 |
Deletion |
Ciena |
CIEN |
Information Technology |
|
Feb 9, 2026 |
S&P SmallCap 600 |
Addition |
ADT |
ADT |
Consumer Discretionary |
|
Feb 9, 2026 |
S&P SmallCap 600 |
Deletion |
Arrowhead Pharmaceuticals |
ARWR |
Health Care |
|
Feb 10, 2026 |
S&P SmallCap 600 |
Addition |
OneSpaWorld Holdings |
OSW |
Consumer Discretionary |
|
Feb 10, 2026 |
S&P SmallCap 600 |
Deletion |
Dynavax Technologies |
DVAX |
Health Care |
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